See the little row of formatting tools buttons above where you're typing your post? Click the one that looks like an image icon, ninth from the right. It will prompt you for the URL. Paste it in there.

BANG.

Image!

You can type out the tags manually, too. You can see examples of BBCode tags here:

I think it is because, when you upload your photo's into your gallery, they are on the web. When they are on the web, the server can download them and put them in your message.
I had questions also, but now I know.

I think it is because, when you upload your photo's into your gallery, they are on the web. When they are on the web, the server can download them and put them in your message.
I had questions also, but now I know.

When you click the gallery image to blow it up and display it, right click on the image. Depending on your browser, you'll get a variation on "copy image location" or "copy image URL" or some such as an option. Click it. That will copy the image's URL to your pasteboard.